South Nietta is a rural locality in the local government areas (LGA) of Central Coast and Kentish in the North-west and west LGA region of Tasmania.

The locality is about 38 kilometres (24 mi) south of the town of Ulverstone.

The 2021 census could not record a population for the state suburb of South Nietta because the population was too low.

South Nietta was gazetted as a locality in 1965.

[4] Route C129 (South Nietta Road) enters the locality from the north.